The coral organisms on a coral reef cannot be replaced by any other organism.For that reason,we identify those species as:

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Keystone species are those species that have a unique and crucial role in maintaining the balance in their ecosystem. The coral organisms on a coral reef are considered keystone species as they create habitats for many other organisms that depend on the coral reef for shelter, food, and protection. If the coral organisms were to disappear, the entire ecosystem would completely collapse. Therefore, these species are irreplaceable and critical for the survival of the ecosystem.

The Coral Organisms on a Coral Reef Cannot Be Replaced